Mechanical calculators

My name is Kees Nagtegaal. I made this site for collectors of non-electric mechanical calculating devices.

My collection has more than a hundred mechanical calculators (Odhner, Brunsviga, Facit, Addiator, Produx, etc.), addingmachines (Comptometer, Burroughs, Plus, etc), counters (Durant, Record, Hengstler, Dux, etc), slide-rules (Aristo, Nestler,etc) etc. You can see them all with description in the gallery. On other places you can find my books and manuals.